Method and device for performing PCO reaction and air purifier comprising the device

1. A method for performing photocatalytic oxidation (PCO) reaction, the method comprises:

guiding an air flow into a PCO reactor, said PCO reactor containing a photocatalyst;

obtaining a humidity of the photocatalyst using a hygrometer;

splitting the air flow into a first stream and a second stream dependent on the obtained humidity of the photocatalyst, wherein a quantity of the first stream being less than a quantity of the second stream;

adjusting the humidity of the first stream to a target humidity according to the obtained humidity of the photocatalyst;

adjusting the humidity of the photocatalyst by guiding the adjusted humidity first stream to the photocatalyst;

guiding the second stream through the photocatalyst; and

illuminating the photocatalyst with a light.

2. The method according to claim 1 , wherein the step of adjusting comprises:

modulating the humidity of the first stream to the target humidity according to a difference between the obtained humidity of the photocatalyst and a predetermined humidity of the photocatalyst.

3. The method according to claim 2 , wherein in the step of adjusting:

the first stream is humidified if the obtained humidity of the photocatalyst is lower than the predetermined humidity of the photocatalyst;

the humidity of the first stream is kept unchanged if the obtained humidity of the photocatalyst is equal to the predetermined humidity of the photocatalyst; and

the first stream is dehumidified if the obtained humidity of the photocatalyst is higher than the predetermined humidity of the photocatalyst.

4. The method according to claim 1 , wherein the method further comprises:

detecting the humidity of the air flow.

5. The method according to claim 1 , wherein the humidity controlling channel comprises:

a first channel is configured to humidify the first stream,

a second channel configured to retain the humidity of the first stream, and

a third channel configured to dehumidify the first stream.

6. A device for performing photocatalytic oxidation (PCO) reaction, the device comprises:

a PCO reactor comprising:

photocatalyst;

an air flow channel configured to:

guide an air flow into the PCO reactor for PCO reaction;

a hygrometer configured to:

obtain a humidity of the photocatalyst in the PCO reactor;

an air splitting unit configured to:

split the air flow into a first stream and a second stream dependent on the obtained humidity of the photocatalyst, wherein a quantity of the first stream being less than a quantity of the second stream, and;

a humidity controlling channel configured to:

adjust the humidity of the first stream to a target humidity according to the obtained humidity of the photocatalyst, and

adjust the humidity of the photocatalyst by guiding the adjusted humidity first stream to the photocatalyst; and

a main stream channel configured to

guide the second stream through to the photocatalyst.

7. The device according to claim 6 , wherein the humidity control channel is configured to:

adjust the humidity of the first stream to the target humidity according to a difference between the obtained humidity of the photocatalyst and a predetermined humidity of the photocatalyst.

8. The device according to claim 7 , wherein the humidity control channel is configured to:

humidify the first stream when the obtained humidity of the photocatalyst is lower than the predetermined humidity of the photocatalyst;

retain the humidity of the first stream when the obtained humidity of the photocatalyst is equal to the predetermined humidity of the photocatalyst; and

de-humidify the first stream when the obtained humidity of the photocatalyst is higher than the predetermined humidity of the photocatalyst.

9. The device according to claim 6 , wherein the device further comprises:

a humidity sensor configured to detect the humidity of the air flow.

10. The device according to claim 6 , wherein the humidity controlling channel comprises:

a first channel configured to humidify the first stream;

a second channel configured to retain the humidity of the first stream; and

a third channel configured to dehumidify the first stream.

11. The device according to claim 6 , wherein the PCO reactor comprises:

an inner tube; comprising:

a first opening, and

a second opening, the inner tube being perforated, wherein the photocatalyst is arranged on an inner surface of the inner tube;

an outer tube comprising:

a third opening, and

a fourth opening, the outer tube jacketing the inner tube to form a jacket chamber between the inner tube and the outer tube, the jacket chamber comprising a jacket chamber opening between the first opening and the third opening;

a sealing surface extending between the second opening and the fourth opening; and

a light source; arranged within the inner tube.

12. The device according to claim 11 , wherein the first stream is guided into the jacket chamber and the second stream is guided into the inner tube from the first opening.

13. The device according to claim 6 , wherein a quantity of the air flow in the first stream and a quantity of the air flow in the second stream is in a ratio dependent on the humidity of the photocatalyst.

14. An air purifier comprising:

a PCO reactor device comprising:

an air flow channel configured to:

guide an air flow for PCO reaction;

a hygrometer configured to:

obtain a humidity of the photocatalyst;

an air splitting unit configured to:

split the air flow into a first stream and a second stream based on the obtained humidity of the photocatalyst, wherein a quantity of the first stream being less than a quantity of the second stream;

a humidity controlling channel configured to:

control the humidity of the first stream to a target humidity based on the obtained humidity of the photocatalyst, and

adjust the humidity of the photocatalyst by guiding the adjusted humidity first stream to the photocatalyst; and

a main stream channel configured to

guide the second stream through the photocatalyst.